Crushing-mill.



Patented Dec. 3, 1918.

2 sains-sign T. l. STURTEVANT.

CRUSHING MILL.

APPucATloN FILED ra.2 a.19|.

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T. 1. STURTEVANT. cRusHlNG MILL.

APPLICATION FILED FEB. 23. 1918.

Patented Deo. 3, 1918.

2 SHEETS-SHEET 2.

v imei-wia?? UNITED sTATEs PATENT oEEIcE.

THOMAS J. STURTEVANT, OF WELLESLEY, MASSACHUSETTS. ASSIGNOR TO STURTEVANT MILL COMPANY, 0E BOSTON, MASSACHUSETTS, A CORPORATION 0F MAINE.

cEUsHING-MILL.

Specification of Letters Patent.

Patented Dec. 3, 1918.

Application filed February 23, 1918. Serial No. 218,648.

To all whom z'tmay concern Be it known that I, THOMAS J. STURTE- VANT, a citizen of the United States, residing at Wellesley, county of Norfolk, and State of Massachusetts, have invented an Improvement in Crushing-Mills, of which the following description, in connection with the accompanying drawings, is a. specification, like characters on the drawings representing like parts.'

The invention hereinafter described-re lates to crushing mills for reducing rock, fertilizer, bone, clay, minerals and other materials.

In my copending application Serial No. 184,570, filed August 6, 1917, is shown, described and claimed a crushing mill cornvprising a casing having a body -and a door hinged together on a vertical axis and containing rotary hammer means coperating with a stationary crushing surface or grade mounted in said body for reducing materials fed between said rotary hammer means and crushing surface, The construction is such that the doen" may be easily unfastened and swung on the vertical axis of its hinges to permit convenient access to the interior of the casing body and door for purposes of inspection, cleaning, adjustment and repair, and to allow ready insertion of parts therein and removal of the same therefrom. This mill is admirably sultedA for reducing certain materials, but for certain classes of work it is desirable to employ a more extended crushing surface or grate for coperation with the rotary hammer means to properly reduce the materials. The present invention, among other objects, provides a mill having a casing formed on a main body and an annex, in the present instance, connected by hinge means having a vertical axis, said body and annex constituting chambers adapted to meet in a vertical plane and both receive sections of a combination grate, and both receive hammer or crushing means cooperating with said grate to crush .materials'fed between them. The construction is such that the annex may be easily swung on its hinge means to separate theV grate sections and allow materials thereon to dump through the space thus produced between the sections. This is accomplished without adjustment 4 or movement of the grate sections with respect to the chambers in which they are mounted. but wholly incidental to the opening of the chambers.

said body and removed therefrom as desired. In fact, on opening the annex, the entire operatlng mechanlsm including the hammer means and grate sections may be inserted' into the body and annex and removed therefrom through the space between the body and annex, and ready access may be had through said space to the internal parts of the mill for the purpose of inspection, cleaning, adjustment and repair thereof.

The character of the. invention may be best understood by reference to the followlng description of one good form thereof shown in the accompanying drawings, wherein:

Figure 1 is a side elevation of the mill shown herein as embodying the invention, the door thereof being shown in open position disclosing the bars of the crushing surface carried thereby;

.Fligz 2 is a vertical section through the m1 Fig. 3 is a horizontal section taken on line 3-3 of Fig. 2; and

Fig. L1 is a horizontal section taken on line 4-4 of Fig. 1. v

Referring to the drawings, the machine shown therein to illustrate the invention comprises a casing having a main body l vand a door or annex 3 connected to said body Walls. The rear wall may also have flanges 17 (Fig. 2) curving downwardly and inwardly for a purpose to be'described. The

upper end of the body of the casing has an inlet or opening 19 through which the materials to be reduced may be introduced into the caslng, and the bottom of the casing another to be subed within the casing and cooperate with ropresent tary crushing means, to be described, to ref duce the materials fed between them. In the instance of the invention, this surface is in the form of a combination grate comprising a section having a series of strong steel bars or rods 27 extending horizontally across the body of the casing through holes in the flanges 17, referred to, and registering holes in the side walls 9 of the casing body, said bars or rods being confined against longitudinal movement by cover plates'- Q9 placed over the ends of said rods and secured to the side walls by suitable screws 31. To contribute to the support of the bars or rods 27, the rear wall may have a portion 33 curving and presenting a series of grooves or seats 35 for the bars or rods.

The construction is such that the bars or rods may be readilyv inserted in place and removed for purposes of replacement and repair thereof.

To further reduce the material, the 'crushing surface may include a section comprising a series of bars or rods 37 extending horizontally across [the body of the casing. and having their ends inserted in holes in curved plates 39 secured by suitable bolts 41'to the. side walls 9. The upper ends of the curved plates may rest in seats or recesses 43 (Fig. 2) in the flanges 17, referred to, and the op posite ends of said curved plates may terminate at the open end of the casing body where it meets the door. The construction is such that the series of bars 37 may form a continuation of the series of bars 27.

In order that the materials may be further reduced, the crushing surface may include a section having a series of bars or rods 45 with their ends inserted in holes in curved plates 47 secured by bolts 49 to the side walls of the door or annex 3. The lower ends of the curved plates 47 may register with the adjacent ends of the curved plates 39, referred to, and the upper ends of said curved plates may terminate substantial-ly at the level of the uppermost bar of the series of bars 27. The construction is such that the series of bars 45 may constitute a continuation of the series of bars 37.

The curved plates 39 and 47 may be readily inserted in the body and door of the casthe plate to be re-` projecting forward and inwardly ing and removed therefrom as required.

The series of bars 37 and -15 may extend hori zontally across the casing and the door or annex and be of appropriate length to fit between the side walls thereof, the latter serving to prevent longitudinal movement of said bars.

The rotary hammer means coperating with the crushing surface described, in the present instance of the invention, comprises a horizontal shaft, 51 journaled in bearings in bosses (Figs. l and 3) mounted in and through slots 55 having ends opening at the side of the casing covered by the door. These bosses may have collars 5T secured by bolts 59 to the sides 9 of the body of the casing.' Groups of hammers or bars 61 (Figs. 1, 2 and 3) may be pivotally mounted on pins G3 on a carrier conveniently in the form of a series of spaced plates G5 each having a series of holes (S7 therein through which the pins 63 extend, the latter being confined against longitudinal movef ment by cotter pins adjacent the ends thereof. The holes (57 may be at different radial distances from the axis of the carrier and permit the pins to be adjusted outward from the axis of the shaft as the hammer are reduced in length from the wearthereon. Spacing plates G9 may be interposed between the plates G5 to hold the latter in proper relation, and the assembly of plates may be secured together by through rivets 71 (Fig. 2). The, carrier thus formed may be mounted fast on the shaft 51, referred to, and rotate therewith.

The construction is such that on release. of the bolts 59, the boss bearings, shaft, carrier and hammers may be removed as a unit from the casing by sliding the boss bearings horizontally outward through the openings of the slots 55.

The shaft 51 may have a pulley 73 (Fig.- 3) fast thereon, which may be driven byv a belt from any suitable source of power.

rlhe door or annex may have an angle bar or member 75 secured to the top thereof anal mating with -a similar' angle bar or member 77 secured tothe top of the body of the casing. To secure the door in its closed uosition, it may have an vangle bar or mem er 81 secured to the side of the door opposite its hinges and mating with a similar angle bar or member 83 detachably secured by bolts 84 to the side of the body of the casing opposite the hinges, said bars being detachably secured together by latches 85 on bolts 8G carried by a flange of the angle bar which may be somewhat wider than the corresponding flange of the angle bar 81 to allow the latches to engage the edge thereof. The construction is such that the door may be quickly unlatched and opened and closed as required. The angle bar 83 crosses the4 open ends of the slots 55 which receive the' casing, but that its shaft is located closelyi adjacent to the vertical plane where the door or annex meets' the body of the casing. As a consequence, the rotary hammer means projects a substantial distance into the interior of both chambers of the casing, and a substantial portion of said hammer means projects beyond the body of the casing and is exposed when the door is opened, Also, the door meets the body of the casing on a vertical plane which is inward somewhat toward the shaft away from the pins 63 on which the hammers 61 are mounted. As a result, on opening of the door the ends of said pins are uncovered when rotated out from said plane, thereby permitting said pins to be slid longitudinally to allow ready removal of the hammers therefrom At the same time the door meets the body of the casing 0n a vertical plane sufficiently removed outward from the shaft -to allo-W Ithe door to. swing .to its open and closed positions without requiring excessive clearances between the sides of the door and the hammer means and its carrier. Also, sincethe door meets the body of the casing on a vertical plane which is at a substantial distance outward from the shaft, the bodyv of the casing may have a' substantial length to rest upon and receive adequate supp-ort from the foundation for the mill.` The door may project beyond said foundation and be carried entirely by..

the body.

The heavy duty which the mill may be called upon to perform produces Wear on the hammers and the grate bars, requiring frequent adjustment of the hammers to compensate for'the wear thereon and frequent replacement of the hammers and bars. Also, large 0r Yuncrushable masses frequently enter the mill which require removal to permit the continued eiicient crushing of materials. These conditions render easy access tothe hammers and bars of great importance in the practical operation of the mill. Prompt access may be `readily had to said parts merely by releasing the latches and swinging the door to its open position.

If any obstructions should be jammed between the hammers and the portion of the grate mounted in the body of the casing, a suitable implement may be. readily .thrust down through the inlet and poke the obstruction downalong and from said grate portion after the door has been opened.

The opening of the door also'desirably access @thereto `for cleaning and repair thereof.

The series of bars 27, 37 v and 45 described 'carried by the body and door, constitute a crushing surface or grate which is continuous when the'door is closed, but the body and door sections will automatically separate on swinging of the door and one of the grate sections sidewise and dump any material thereon. Also opening of the door or annex will permit introduction of all of the working parts'into thecasing, and removal thereof from the casing through the open sides of the two chambers which are thus conveniently exposed.

It will be understood that the invention is not limited to the specic embodiment shown, but that 'various deviations may be made therefrom without departing from the spirit and scope of the appended claims.

What is claimed is 1. A machine of the character described, comprising in combination, a casing having a body and a door, hinge means connecting said door with said body on a vertical axis,

bearings in said body adjacent said door, a horizontal shaft journaled in said bearings and extending parallel to said door, a carrier on said shaft, hammers connected to said carrier and projecting a substantial distance into said door, a sectional crushing surface curved to conform to the rotary path of said hammers, means supporting one section of said surface, in the body of the casing, land means supporting the other section of said surface in said door, that openingof said door may render accessible said carrier, hammer, and both of said surfaces.

2. A crushing mill, comprising in combination, a casing having two chambers adapted to meet in a substantially vertical plane, said chambers being relatively movable to "exp'ose their interiors, means normally to secure said chambers in closed position, a combination crushing surface having a section mounted in and carried by each of said chambers, said sections being separable on relative movement of said chambers, a horizontl shaft journaled in one of said chambers adjacent to said vertical plane, and crushing means carried by said shaft and projecting into both of said chambers to cooperate -with said sections to crush materials.

3. A crushing mill, comprising in combination, a casing having two chambers adapted to met in a vertical plane, said chambers being relatively movable to expose their interiors, means normally to securesaid chambers in closed position, a crushing surface having a section mounted in each of said chambers, one of said chambers having bearing recesses opening at said plane. a shaft mounted in said recesses, removable means for holding said shaft in said recesses, and

rotary crushing means on said shaft cope 'ating with said sections to crush materials, said sections, shaft and crushing means being removable through the space occurring between said chambers when the latter are relatively moved to expose their interiors.

4. A crushing mill, comprising in combination, a casing having two chambers adapted to mee-t on a vertical plane, said chambers being relatively movable to expose their interiors, means to secure said chambers in closedv position, a grate having separate sections mounted in said chambers, said casing having an inlet above said grate, and an outlet beneath said grate, that ready access may be had to the upper and lower surfaces of said sections on relative movement of said chambers to expose their interiors, a horizontal shaft mounted in one of said cham bers, and hammer means carried by said shaft and coperating with said grate sections to crush materials in their transit from said inlet through said grate to said outlet.

A crushing mill, comprising in combination, a casing having parts hingedi together on a vertical axis, and relatively movable to open and closedpositions, a crushing surface having a section mounted in 'each of said casing parts, a horizontal, rotary'shaft, and crusher means carried by said shaft and coperating with said sections to reduce materials, said sections being curved 0r inclined downwardly beneath said crusher' means and adapted to meet when `the casing parts are closed and to separate when said parts are opened.

6. A crushing mill, comprising, in combination, a casing having parts hinged together on a vertical axis and rela-tively movable to open and closed positions, a crushing surface having a. section mounted in each of said casing parts, one of said sect-ions constituting a continuation of the other when the casing is closed, a horizontal shaft, and rotary hammer` means carried by said shaft and eoperating with said crushing surface to reduce materials fed between them, said sections being spaced apart when said casing is opened.

7. A crushing mill, comprising, in combination, a 'asing having parts hinged together on a vertical axis, one of said parts heilig movable relatively to the other to open and closed positions, a crushing surface having a section mounted in each of said casing parts, one of said sections constituting a continuation of the other when the casing is closed, a horizontal shaft extending substantially parallel lto the plane of juncture of said casing parts, and rotary hammer or Crusher means carried b v said shaft and cooperating with said crushing surface to re.-

duce materials fed between them, the section of said movable part being adapted to swing side-wise therewith to interrupt the sections.

8. A crushing mill, comprising, in combination, a casing having parts hinged together on a vertical axis and relatively movable to openand closed positions, each of said parts having opposed fiat walls, the walls of one part forn'iing in effect a continuation of the walls of the other part, a crushing surface having a section mounted in and extending between the opposed walls of each of said casing parts, a horizontal shaft journaled in the opposed walls of one of said parts, and rotary hammer means carried by said shaft and adapted to project into both of said casing parts to cooperate with the crushing surface therein and reduce materials fed between'said surface and hammer means. i

9. A crushing mill, comprising, in combination, a casing having hollow parts hinged together on a vertical axis and relatively movable to open and closed positions, a crushing surface having a section mounted Ain each of said casing parts and adapted to open and close on relative movement of said hollow parts to open and closed positions, a' shaft extending transversely to said vertical axis, and rotary hammer or erusher means on said shaft cooperating with both sections of said crushing surface to reduce materials fed between them.

ln testimony whereof, l have signed my name to this specification THGMS J. STURTEVANT. 

